公开(公告)号：US3471831A

公开(公告)日：1969-10-07

申请号：US3471831D

申请日：1964-12-28

Applicant: NAT RES DEV

Inventor： PARKS JOHN RONALD

IPC: G06K9/52 ,  G06K9/02 ,  G06K9/08

CPC classification number: G06K9/522 ,  G06K2209/01

公开(公告)号：US3605093A

公开(公告)日：1971-09-14

申请号：US3605093D

申请日：1969-06-25

Applicant: NAT RES DEV

Inventor： PARKS JOHN RONALD ,  DAVIS CHARLES HOWARD ,  PLUMB GERALD OWEN

IPC: G06T7/60 ,  G06K9/46 ,  G06K9/00

CPC classification number: G06K9/4609 ,  G06K2209/01

Abstract: System and apparatus for recognizing both handwritten and machine-printed character patterns in which the character filed is scanned by photoelectric means to generate an analog-form signal which is converted into a four-bit binary form and fed to a four-bit parallel shift register from which differently delayed versions are taken to summing circuits in the development of ntuples which operate to detect the presence of short line segments of specific orientation within the character area. By means of further summing circuits the line segment responses are analyzed to identify and indicate the position of a number of different topographical features such as line endings, bends or corners, line junctions and line crossings. These feature responses are converted into a list of code signals for matching, as by computer, with standard lists of similar code signals derived from ranges of different standard characters.

公开(公告)号：US3563634A

公开(公告)日：1971-02-16

申请号：US3563634D

申请日：1967-12-14

Applicant: NAT RES DEV

Inventor： PARKS JOHN RONALD ,  RENGGER RALPH ERIC

IPC: G06K9/74 ,  G02B27/38

CPC classification number: G06K9/74

Abstract: OPTICAL ARRANGEMENTS FOR ISOLATING CHOSEN SPATIAL FREQUENCY COMPONENTS OF AN ANALOGUE FORM DENSITY OR INTENSITY OBJECT PATTERN, E.G. A PRINTED CHARACTER, IN WHICH A TRANSPARENCY OF THE OBJECT PATTERN IS DISPOSED IN A COLLIMATED LIGHT BEAM AND BY MEANS OF AN OPTICAL SYSTEM A DIFFRACTION PATTERN IS PRODUCED IN OR BEYOND THE FOURIER PLANE, SAID FOURIER PLANE CONTAINING A LIGHT STOP HAVING AN ANNULAR PASS APERTURE AND THE LIGHT PASSING SAID STOP BEING IMAGED IN A RESULTANT IMAGE PLANE.

公开(公告)号：US3553456A

公开(公告)日：1971-01-05

申请号：US3553456D

申请日：1968-05-31

Applicant: NAT RES DEV

Inventor： PARKS JOHN RONALD ,  RENGGER RALPH ERIC

IPC: G01B11/25 ,  G01N21/30 ,  G01B1/00

CPC classification number: G01B11/25

Abstract: A method and apparatus are disclosed in which a trace is optically projected on photocells incorporated in electrical circuitry providing a signal indicating the nearest photocell to a reference point on which the trace image is incident. The photocells can be positioned in line from the reference point and the image rotated around the point. The trace can be related to a standard profile, the distance of its image from the reference point representing divergences of workpiece profile from the standard. Provision can be made for providing a further signal indicating the direction of any such divergence. Provision can also be made for suppression of the signals except when they result from incidence on a photocell of light intensity greater than ambient intensity. In an alternative arrangement, the photocells comprise rings concentric on the reference point. The photocells may instead from a semicircular array, the image being doubled about the edge diameter thereof, or a pair of such arrays, the image being duplicated for projection on each array.